What this light curtain does
The Omron F3SJ-A1205P20 is a Type 4 safety light curtain from the F3SJ-A series, rated for finger and hand protection with a 20 mm detection capability. The 15 mm beam pitch and 80 beams give a 1205 mm protective height — sized for guarding a vertical opening like a machine load/unload station or a robot cell entry. The 0.2 m to 9.0 m operating range covers most reach-in applications; you set the range to match the hazard distance, not the other way around. Built-in blanking and muting functions let the curtain ignore fixed obstructions (a fixture post, a part hanging into the field) and automatically bypass during a defined material pass-through cycle. That keeps the line running without a separate override circuit.
Deployment context
Rated IP65 — dust-tight and protected against water jets — so it handles washdown environments in food processing or machining coolant mist. The 24 VDC supply is standard for safety circuits; the emitter and receiver draw from the same PELV source. Mounting brackets and alignment aids are part of the F3SJ system; the column extrusions accept M4 hardware at 50 mm intervals for column-mount or T-slot integration.
Listed as active in the manufacturer's system. The F3SJ-A series remains a current catalog line, so this order code is a standard production item — no last-time-buy clock to watch.